The sold flat caps archive provides an idea of the variety of materials that have been used to make the flat caps. Yes, some of these were custom requests. Several of the materials are no longer available. If you see an item that you would like, please submit an inquiry via a custom request and we will let you know if it is possible to locate the material and make one for you. Please call 913-397-8071 or email [email protected] to talk about it.